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FPGETMASK(3) FreeBSD Library Functions Manual FPGETMASK(3) NAME fpgetmask, fpgetround, fpgetsticky, fpsetmask, fpsetround, fpsetsticky - IEEE FP mode control SYNOPSIS #include <ieeefp.h> fp_except fpgetmask(void); fp_rnd fpgetround(void); fp_except fpgetsticky(void); fp_except fpsetmask(fp_except mask); fp_rnd fpsetround(fp_rnd rnd_dir); fp_except fpsetsticky(fp_except sticky); DESCRIPTION A rounding mode is one of FP_RZ, FP_RM, FP_RN, or FP_RP, for rounding towards zero, rounding (Minus infinity) down, rounding to nearest, and rounding (Plus infinity) up. The default mode is FP_RN. An fp_except value is a bitmask specifying an exception type and containing any of the values listed below. FP_X_INV Invalid Operation FP_X_DZ Division by zero FP_X_OFL Overflow FP_X_UFL Underflow FP_X_IMP Imprecision (inexact) FP_X_DNML Denormalization (amd64 and i386 only) The fpsetmask() function will cause future operations with the specified result status to raise the SIGFPE exception. The fpsetround() function will cause future operations to use the specified dynamic mode. Note: On some architectures, instructions can optionally specify static rounding modes and exception enables that will supersede the specified dynamic mode. On other architectures, these features may not be fully supported. The fpsetsticky() function will set or clear the specified exception history bits. RETURN VALUES The fpgetround() and fpsetround() functions return the (previous) rounding mode. The fpgetmask(), fpsetmask(), fpgetsticky(), and fpsetsticky() functions return the (previous) exception mask and exception history bits. SEE ALSO sigaction(2) FreeBSD 14.1-RELEASE-p8 September 14, 2015 FreeBSD 14.1-RELEASE-p8